Mandrel

ABSTRACT

A yarn winding core and mandrel assembly wherein the mandrel is an expansible mandrel having at least one annular yarn snaggling means. The core is a slotted core which when mounted on the mandrel will have the yarn receiving slot positioned over the annular yarn snagging means.

[ 1 Oct. 23, 1973 United States Patent [191 A Sobel b a D.

6/l970 Zeis et al.

, Cumberland, Md.

II r PEP 6690 6667 9999 llll /l 0121.. ll 46 O 0 9 1 1 62 87 78 81 1 A5, 33 33 22] Filed:

Primary ExaminerStanley N. Gilreath Attorney-Thomas J. Morgan et al.

21 Appl. No.: 186,637

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ted core which when mounted on the mandrel will have the yarn receiving slot positioned over the annu References C'ted lar yarn snagging means. UNlTED STATES PATENTS 24208 PW 6 Claims, 2 Drawing Figures 9/1964 Rhein, Jr 242/18 A 3,103,305 9/1963 Heatherly............. 3,149,795

PMENTEDWI 2 3 I815 Martin Sobel INVENTOR ATTORNEY MANDREL This invention relates to a yarn winding core and mandrel assembly and more particularly to a yarn winding core and mandrel assembly which is amenable to rapid start up.

It is known in the art to provide mandrels or bobbin chucks for synthetic filamentary material, the mandrel or chuck face being radially movable so as to engage and disengage a yarn winding sleeve.

Various types of mandrels or bobbin chucks are commerically available, the types including both pneumatic and mechanical actuation of yarn core locking devices. The locking devices themselves may be in the form of buttons, lugs, leaves or inflatable rings or tires. Representative of mandrels employing mechanically actuated yarn core locking devices are U.S. Pat. Nos. 3,494,565; 2,670,905 and 3,593,934. Representative of mandrels employing pneumatically actuated yarn core locking devices in US. Pat. No. 3,517,891. The pneumatically actuated device consists in brief of a spool-like body mounted for axial rotation on a shaft. The body contains annular recesses which are rendered fluid tight by elastic bands. When fluid is supplied to the annular recesses, the bands expand and are able to lock a yarn core to the mandrel.

Such prior art devices however, have no provisions for yarn end pick up; that is to say, an operator must pass yarn several wraps around a yarn core 'or winding tube before winding operations commence. Such an operation is time-wasting, in addition to wasting considerable amounts of yarn.

It is therefore an object of this invention to provide a yarn winding core and mandrelassembly having yarn end pick up means.

It is another object of this invention to provide a pneumatic expanding chuck suitable for receiving a plurality of yarn winding sleeves, each of which is amenable to yarn end pick up.

In accordance with this invention, it has now been discovered that ready yarn end pickup in a yarn winding core and mandrel may be had by providing an expandable mandrel with at least one annular yarn snagging means and employing a core having a yarn receiving slot being positioned over the annular yarn snagging means. In operation, a yarn end is simply held against the slot where it is secured by the yarn snagging means directly beneath the slot, allowing winding operations to commence immediately. While any of the well known mandrels may be employed inthe novel assembly of this invention, it is preferred that the mandrel be a pneumatically expansible mandrel. The annular yarn snagging means may be a pressure sensitive adhesive, a plurality of pin members, a bristle surface or the like.

These and other objects of the invention will become more readily apparent from a discussion of the drawings wherein: I 1

FIG. 1 is a partially exploded projected view of the core and mandrel assembly of this invention;

FIG. 2 is a cross-sectional view of the mandrel assembly of this invention.

Turning to FIG. 1, pneumatic inflatable chuck assembly l is fitted with core member 2, and subsequently with core member 3 which is shown in exploded position. Both core members 2 and 3 have slot members 4 and 5 respectively, slot members 4 and 5 extending through the wall of said core members. Pneumatic inflatable chuck assembly 1 is designed such that sleeve member 6 may be inflated by means of an appropriate air feed which is controlled by means of valve member 7. On inflating elastic sleeve member 6 substantial portions of core member 2 and core member 3 when in a mounted position, are engaged. Expandable pneumatic chuck assembly 1 is also equipped with pin members 8 disposed within a recessed annular groove, positioned on either side of elastic band member 6. As can be seen from FIG. 1 of the drawings when core member 3 is positioned in an abutting relationship with core member 2, slot member 5 of core member 3 willbe disposed immediately above pin members 8. In yarn winding operations, a yarn end may easily be threaded into slot member 5, trapped on pin members 8 and the assembly thereby readied for yarn winding operations. Correspondingly, a similar procedure may be followed on core member 2 wherein slot member 4 is disposed above an annular series of pin members which are not illustrated.

The rotation of expansible pneumatic chuck assembly 1, may be more readily seen in the partial crosssection view set forth in FIG. 2 wherein it may be seen that the chuck assembly 1 rotates on shaft member 9 which is provided by the front roller bearing 10 and rear roller bearing 11. Suitable brake means which are not illustrated engage shaft member 9 immediately behind roller bearing 11, and provide frictional contact between shaft 11 and shuck assembly 1. Moreover, the disposition of pin members 8 within annular grooves 12 may be more readily seen in FIG. 2 of the drawings as well as the air feed for expansible sleeve member 6 which is passed from valve member 7 through passage 13 to the area immediately between chuck assembly 1 and the inner surface of flexible sleeve member 6, flexible sleeve member 6 being secured to chuck assembly l by means of flange members 14. Preferably, chuck assembly 1 is also provided with a flange member 15 which serves as a stop and prevents yarn core member 2 from being improperly positioned.

Drive for the chuck assembly of this invention may be of the surface drive type; that is to say, an assembly comprising a bobbin support journaled about a spindle and a means for clutching and braking the bobbin support. A yarn winding sleeve mounted on the journaled support is driven peripherally by contact with a power drive roll. The chuck assembly may be mounted on a pivotal swing arm to accommodate for the growth of a yarn package during the winding process and for donning and doffing operations.

Doffing of yarnwound sleeve members of this invention is readily conducted by releasing air through valve member 7, thereby collapsing flexible sleeve member 6 and thereby removing sleeve member 6 from contact with the yarn wound sleeve. The yarn originally trapped by pin members 8 in recessed annular groove 12 is merely broken when the yarn wound sleeve member is disengaged and the chuck is then ready to receive new empty sleeve members.

Having thus disclosed the invention, what is claimed:

1. A yarn winding core and chuck assembly comprising an expansible chuck having at least one annular yarn snagging means and at least one yarn winding core disposed on said chuck, said core having a yarn receiving slot, said slot being positioned over said annular yarn snagging means.

2. The yarn winding core and chuck assembly of claim 1 wherein said expansible chuck is a pneumatic expansible chuck.

3. The yarn winding core and chuck assembly of claim 1 wherein said expansible chuck has two spaced annular yarn snagging means and wherein a slotted yarn winding core is disposed over each of said annular yarn snagging means.

4. The yarn winding core and chuck assembly of claim 1 wherein said annular yarn snagging means is a plurality of pin members disposed in an annular groove which circumscribes the face of said chuck.

5. A yarn winding core and chuck assembly comprising a pneumatic expansible chuck and slotted yarn winding cores on said chuck, said chuck having a centrally disposed inflatible elastic band member for engaging and holding said cores, and an annular yarn snagging means on either side of the said band member, each of said annular yarn snagging means being fitted in close proximity with the slot of a respective slotted yarn winding core, said slot extending through the wall of said core.

, 6. The yarn winding core and chuck assembly of claim 5 wherein each said annular yarn snagging means is a plurality of pin members disposed in an annular groove which circumscribes the face of the chuck. 

1. A yarn winding core and chuck assembly comprising an expansible chuck having at least one annular yarn snagging means and at least one yarn winding core disposed on said chuck, said core having a yarn receiving slot, said slot being positioned over said annular yarn snagging means.
 2. The yarn winding core and chuck assembly of claim 1 wherein said expansible chuck is a pneumatic expansible chuck.
 3. The yarn winding core and chuck assembly of claim 1 wherein said expansible chuck has two spaced annular yarn snagging means and wherein a slotted yarn winding core is disposed over each of said annular yarn snagging means.
 4. The yarn winding core and chuck assembly of claim 1 wherein said annular yarn snagging means is a plurality of pin members disposed in an annular groove which circumscribes the face of said chuck.
 5. A yarn winding core and chuck assembly comprising a pneumatic expansible chuck and slotted yarn winding cores on said chuck, said chuck having a centrally disposed inflatible elastic band member for engaging and holding said cores, and an annular yarn snagging means on either side of the said band member, each of said annular yarn snagging means being fitted in close proximity with the slot of a respective slotted yarn winding core, said slot extending through the wall of said core.
 6. The yarn winding core and chuck assembly of claim 5 wherein each said annular yarn snagging means is a plurality of pin members disposed in an annular groove which circumscribes the face of the chuck. 